I'm lead to believe that MAC OS is based on a Linux style operating system. If / when the MAC version shows up, it should be easy to bring it into Linux???
OS X (though there will be those who will feel the need to step in and mention Darwin) is based (very loosely) on BSD Unix among others.
It is a Unix OS.
Linux is a Unix clone.
However hardware management as well as kernel concerns are as different as night and day.
The biggest issue however will be that while the Linux community tends to be extremely FOSS agenda aware (especially given the Linux Kernel is the poster child for FOSS projects), OS X users as a whole (there are exceptions, I am one of them) don't know what FOSS stands for or what it means.
Usually when I try to give them the "Free as in beer, or Free as in speech" rhetoric, I usually find that I have just accidentally agreed to buy them a beer. The good news is if I enjoy one with them all tend to go home happy.
In other words it is not impossible to release a closed driver in Linux (look at Nvidia), however it is unlikely (due to level of additional effort) and there will be some level of outcry (search out my Kernel Taint quote if need be). It is however generally unheard of (again always with the exceptions) to have an open source OS X driver.